I just bought me a 92 sc400 and was told that when on the highway for some time the CE light would come on along with the trac off light, well i was driving it home yesterday and the lights came on. i pulled the codes 27 and 28. I started it this morning and now both lights are off. if any one could help out on tellin me what those two codes are it would be great. thanks
-Dustin

 

Those are your O2 sensors, 27 for the ones on the manifold and 28 for the ones in the cat.

 

thanks, is there a way i can check to see which bank the bad O2 is on, or would it be all 4?

 

Its best to replace in pairs. So you should replace all 4

 

alright ill go and buy the sensors, i was readin in some other forums and was wondering if my cats are bad also because they said that could cause the rear sensors to go bad and pull the light, but there is no loss in performance and there is no abnormal smell out of the exhaust. idk just wondering. thanks for the quick resonses